var target = { name: '张三', age: 18 }
var source = { money: '10000' }
var source2 = { sex: 'male' }

var result = Object.assign(target, source, source2)

console.log(source);    // { money: '10000' }
console.log(source2);   // { sex: 'male' }
console.log(result)     // { name: '张三', age: 18, money: '10000', sex: 'male' }
console.log(target);    // { name: '张三', age: 18, money: '10000', sex: 'male' }


